Performance Tuning

sysctl
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sysctl is a mechanism to view and control the entries under
the /proc/sys tree
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sysctl -a - lists all variables
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sysctl -q - queries a variable
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sysctl -w - writes a variable
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When setting values, spaces are not allowed
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sysctl -w net.ipv4.conf.lo.arp_filter=0
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Setting a variable via sysctl on the command line is not
persistent The change is only valid until the next reboot
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Write entries into the /etc/sysctl.conf file to have them
applied at boot time